or

R-controlled vowel: 當母音後面跟著r,r會影響母音的發音

or, orb, for, nor, abhor, cork, fork, pork, stork, horde, ford, afford, cord, chord, discord, record (verb), lord, landlord, sword, snort, short, sort, port, report, export, import, deport, airport, passport, transport, sport, support, resort, contort, distort, extort, escort, scorch, porch, torch, torso, tort, born, morn, torn, thorn, horn, greenhorn, worn, sworn, scorn, corn, popcorn, unicorn, Capricorn, acorn, adorn, accord, absorb, forlorn, storm, norm, normal, dorm, dormitory, dormant, form, inform, conform, perform, platform, uniform, reform, transform, north, forth, forgo, format, formal, formidable, formula, formulate, forge, forage, fortress, forfeit, forward, fortune, fortify, fortitude, fort, forte, force, enforce, endorse, horse, hormone, corner, border, order, disorder, ornate, ordeal, organic, organ, organize, orchestrate, orchid, orchard, ordinary, orbit, ornament, portray, portrait, portal, portable, portfolio, porcupine, porcelain, portion, proportion, purport, important, enormous, gorgeous, gorge, retort, remorse, mortify, morbid, morph, mortgage, mortar, mortal, morsel, chortle, cordial, corpus, corporate, incorporate, corrugate, coordinate, cohort, accordion, sordid, vortex, tortoise, torrent, tornado, torture

*例外: work 的 or 發音不像平常的 or, 要發音為 er, 所以 work 發音為 werk


-er, -or (person or thing connected with)

Sometimes the -er suffix is written as -or (it is still pronounced /ə/)
actor, reactor, animator, ambassador, calculator, navigator, aggregator, evaluator, collaborator, detractor, distractor, protractor, compactor, contractor, subcontractor, narrator, translator, locator, captor, grantor, guarantor, procrastinator, capacitor, radiator, creator, perpetrator, sailor, tailor, purveyor, surveyor, author, auditor, arbitrator, editor, sector, elevator, emulator, educator, demonstrator, generator, ventilator, ancestor, benefactor, decorator, director, selector, inventor, inheritor, investor, investigator, inspector, authenticator, spectator, speculator, regulator, replicator, projector, protector, collector, creditor, debtor, senator, sensor, vendor, legislator, elector, excavator, error, neighbor, predecessor, professor, suppressor, successor, assessor, executor, competitor, differentiator, interrogator, receptor, detector, compressor, aggressor, transgressor, realtor, releasor, mediator, administrator, illustrator, innovator, imitator, visitor, dictator, litigator, instigator, simulator, incubator, integrator, indicator, predictor, descriptor, exhibitor, contributor, distributor, refrigerator, originator, solicitor, facilitator, manipulator, conspirator, licensor, advisor (adviser), survivor, proprietor, violator, hydrator, governor, operator, cooperator, interlocutor, depositor, moderator, commentator, accommodator, prosecutor, prospector, processor, doctor, conqueror, voter, exfoliator, negotiator, coordinator, incorporator, sculptor, conductor, constructor, instructor, trustor, disruptor, obfuscator, counselor, supervisor, juror, curator, communicator, transferor, impersonator, exterminator